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There is only one ZIP spec, but there are a lot of similar-sounding compression schemes that aren't ZIP (bzip, gzip which don't have an internal file structure, for example, and tend to need you to use the tar format underneath to archive/compress a folder).
One of the other problems you are looking at is that the mimetype needs to be stored rather than compressed in the ZIP archive as the first file. Not all zip libraries even support setting compression for individual files (versus the whole archive).
compress doesn't create ZIP archives, which is a key distinction as well.
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